Adds .github/copilot-instructions.md to guide GitHub Copilot coding agent when working with this repository.

Contents

• Repository context: TypeScript library package structure, compilation to lib/, peer dependency model
• Code standards: Strict TypeScript, explicit return types, JSDoc requirements, alphabetical key sorting
• Development workflow: Build/test/lint commands, pre-commit hooks, testing patterns (Jest + React Testing Library in /tests)
• Common pitfalls: Don't import from lib/, maintain peer dependencies, preserve backward compatibility
• Local setup: Development workflow with Data Browser via npm link

Example of documented JSDoc standard:

/**
 * Transforms a route by removing inactivity parameters.
 * @param routes - Array of route strings to transform.
 * @returns The first non-login route without inactivity param, or undefined.
 */
function transformRoute(routes: string[]): string | undefined {
  // implementation
}

Follows best practices from https://gh.io/copilot-coding-agent-tips for repository custom instructions.

• Fixes ✨ Set up Copilot instructions #709

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.